part-5 stacks

简介

stack就是栈，栈的结构是什么样的呢？一层一层是紧挨着的，然后互相依赖，不能说中间少了一个。这样说就很明白了，栈实际上在docker中就相当于多个互相依赖的组件，共同组合成一个完整的项目，比方说你实现了登陆，我实现了登录后的操作。compose也很直白，协奏，乐团～

增加一个服务，然后重新部署应用

• 更新一下docker-compose.yml

version: "3"
services:web:# replace username/repo:tag with your name and image detailsimage: username/repo:tagdeploy:replicas: 5restart_policy:condition: on-failureresources:limits:cpus: "0.1"memory: 50Mports:- "80:80"networks:- webnetvisualizer:image: dockersamples/visualizer:stableports:- "8080:8080"volumes:- "/var/run/docker.sock:/var/run/docker.sock"deploy:placement:constraints: [node.role == manager]networks:- webnet
networks:webnet:

• attach到myvm1，部署应用

eval $(docker-machine env myvm1)
docker stack deploy -c docker-compose.yml getstartedlab

• 打开浏览器如何访问http://192.168.99.101:8080/ 就可以看见图形化的界面了
• 查看进程

➜  docker_file docker stack ps getstartedlab
ID                  NAME                         IMAGE                             NODE                DESIRED STATE       CURRENT STATE           ERROR               PORTS
3hec43yn4z5j        getstartedlab_visualizer.1   dockersamples/visualizer:stable   myvm1               Running             Running 6 minutes ago
xcucj08tfn72        getstartedlab_web.1          btchild/get-started:part-2        myvm2               Running             Running 5 minutes ago
rifl2rqahv30        getstartedlab_web.2          btchild/get-started:part-2        myvm1               Running             Running 7 minutes ago
j75tnimk4r46        getstartedlab_web.3          btchild/get-started:part-2        myvm2               Running             Running 5 minutes ago
ccgcgw2ahkrp        getstartedlab_web.4          btchild/get-started:part-2        myvm1               Running             Running 7 minutes ago
irftco5od5hx        getstartedlab_web.5          btchild/get-started:part-2        myvm2               Running             Running 5 minutes ago

数据持久化

• 更新配置文件

version: "3"
services:web:# replace username/repo:tag with your name and image detailsimage: username/repo:tagdeploy:replicas: 5restart_policy:condition: on-failureresources:limits:cpus: "0.1"memory: 50Mports:- "80:80"networks:- webnetvisualizer:image: dockersamples/visualizer:stableports:- "8080:8080"volumes:- "/var/run/docker.sock:/var/run/docker.sock"deploy:placement:constraints: [node.role == manager]networks:- webnetredis:image: redisports:- "6379:6379"volumes:- "/home/docker/data:/data"deploy:placement:constraints: [node.role == manager]command: redis-server --appendonly yesnetworks:- webnet
networks:webnet:

• 可以看出是增加了redis，需要增加一个本地目录，用来持久化数据

docker-machine ssh myvm1 "mkdir ./data"

• 启动应用

➜  docker_file docker stack deploy -c docker-compose.yml getstartedlab
Creating service getstartedlab_redis
Updating service getstartedlab_web (id: rw916xx9vy7pl89v9nln22yz8)
Updating service getstartedlab_visualizer (id: gvoe98n4fjizj3k88jn6tdr3z)

• 可以通过查看http://192.168.99.101:8080/和http://192.168.99.101来查看相应页面
• 其实遇到了一个问题，然后完全按照步骤来做的，就发现完全不知道问题在哪里，最终想办法找到了日志，发现是app.py最早有个地方写错了，打包的时候就是错的，后期就出现了问题，于是重新打包上传，更新就好了；这里说一下查看log的命令，如下：

docker logs container_name